期刊
SIAM JOURNAL ON SCIENTIFIC COMPUTING
卷 37, 期 2, 页码 B153-B184出版社
SIAM PUBLICATIONS
DOI: 10.1137/140959602
关键词
nonlinear model reduction; structure preservation; Lagrangian dynamics; Hamiltonian dynamics; structural dynamics; positive definiteness; matrix symmetry
资金
- U.S. Department of Energy [DE-AC04-94AL85000]
- Department of Energy Office of Advanced Scientific Computing Research [10-014804]
This work proposes a model-reduction methodology that preserves Lagrangian structure and achieves computational efficiency in the presence of high-order nonlinearities and arbitrary parameter dependence. As such, the resulting reduced-order model retains key properties such as energy conservation and symplectic time-evolution maps. We focus on parameterized simple mechanical systems subjected to Rayleigh damping and external forces, and consider an application to nonlinear structural dynamics. To preserve structure, the method first approximates the system's Lagrangian ingredients-the Riemannian metric, the potential-energy function, the dissipation function, and the external force-and subsequently derives reduced-order equations of motion by applying the (forced) Euler-Lagrange equation with these quantities. From the algebraic perspective, key contributions include two efficient techniques for approximating parameterized reduced matrices while preserving symmetry and positive definiteness: matrix gappy proper orthogonal decomposition and reduced-basis sparsification. Results for a parameterized truss-structure problem demonstrate the practical importance of preserving Lagrangian structure and illustrate the proposed method's merits: it reduces computation time while maintaining high accuracy and stability, in contrast to existing nonlinear model-reduction techniques that do not preserve structure.
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